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Strictly speaking, Hopkalite is a catalyst which is often used to enhance the combustion of carbon monoxide to carbon dioxide and hydrogen to water vapor. Both are pretty combustible and need very little help to burn. The only reason this is an issue for us is that the long life of a catalyst (as opposed to filter media) may result in the Hopkalite being forgotten about unless periodic air analysis is done. There are filter masks sold for pilots that purport to filter out carbon monoxide (among other combustion products). The effective life of these is generally expressed in seconds, enough time to get the descent started and some ventilation going. I suspect they don't work very well for CO even during those few seconds, although staying alive in a CO contaminated atmosphere is generally a matter of something like a tenth of a percent, so it doesn't take much to make a big difference. Don > Carbon monoxide is a byproduct of a combustion engine, so not that much > of concern in an electric powered compressor. But even in those , when > too high temperatures cause oil to diesel, CO can be present. > I believe the stuff to filter that out is called hopkalite. > -Matthias Shop online without a credit card http://www.rocketcash.com RocketCash, a NetZero subsidiary -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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